摘要：Post-harvest hardening of Dioscorea dumetorum yam tubers are characterized by lignify cells. In this study, changes in phenolics in freshly harvested and appropriately stored (28±2°C; 72–85% RH and 5±1°C; 85-100% RH) trifoliate yam tubers using histochemical analysis were studied and related to tissue cohesion and hardening in white and yellow cultivars. Results showed an intense lignified cells (deep safranin red and toluidine blue stained cell wall areas) in most parenchyma tissues of stored white and yellow trifoliate yam tubers (28±2°C, 72-85%RH and 5±1°C, 85-100% RH). In addition, histochemical changes in parenchyma tissues were more moderately in phase with an intense tissue cohesion and hardening in white and yellow trifoliate yam tubers at 28±2°C; 72–85% RH and in yellow trifoliate yam tuber at 5±1°C; 85-100% RH. This finding has given insight into the role of lignified tissue in the hardeningof post-harvest D. dumetorum yam tubers.
